EP 0313020 B1 19940615 - Optical time domain reflectometer with level adjusting function.
Title (en)
Optical time domain reflectometer with level adjusting function.
Title (de)
Optisches Zeitbereichsreflektometer mit Niveaueinstellung.
Title (fr)
Réflectomètre optique dans le domaine de temps, avec fonction d'ajustement du niveau.
Publication
Application
Priority
- JP 24422688 A 19880930
- JP 26185087 A 19871019
Abstract (en)
[origin: EP0313020A2] An optical pulse supplying section (10) supplies an optical pulse to a target optical fiber (40). A reflection light detecting section (51) outputs an electric signal corresponding to the reflection light from the target optical fiber (40). Upon reception of the electric signal from this detecting section (51), a level controlling section (55) controls the level of the received signal according to an initial value or compensation value. An A/D converter (60) receives the output signal of the level controlling section (55) and outputs a digital signal corresponding to the received signal. A parameter input section (71, 72) is for inputting a parameter to determine the level that indicates the reflection light from the target optical fiber (40). An initial value memory stores (81) the initial value to be set in the level controlling section (55), in accordance with the parameter from the parameter input section (71, 72). A compensation value computing section (83) compares the digital signal from the A/D converter, which corresponds to the initial value, with a reference value to compute the compensation value that should be set in the level controlling section (55). A processing section performs a signal processing to output the digital signal from the A/D converter (60).
IPC 1-7
IPC 8 full level
G01M 11/00 (2006.01); G01M 11/02 (2006.01); G02B 6/00 (2006.01)
CPC (source: EP US)
G01M 11/3145 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0313020 A2 19890426; EP 0313020 A3 19910410; EP 0313020 B1 19940615; DE 3850210 D1 19940721; DE 3850210 T2 19950126; DE 3850210 T4 19950810; JP H021527 A 19900105; JP H0762642 B2 19950705; US 4893006 A 19900109
DOCDB simple family (application)
EP 88117405 A 19881019; DE 3850210 A 19881019; DE 3850210 T 19881019; JP 24422688 A 19880930; US 25899588 A 19881017